Study the following information carefully to answer the given questions.

This data is regarding number of Junior Coliege students, Graduate students and Post-Graduate students (PG) only, studying in colleges A, B, C and D.
The respective ratio between the total number of students studying in the Colleges A, B, C and D is 3 : 5 : 2 : 5. In College A, 40% of the total number of students are Junior College students. Out of the remaining, the respective ratio between the number of Graduate students and number of PG students is 5 : 4.
In College B, $${2 \over 5}$$th of the total number of students are Junior College students. Out of the remaining, the respective ratio between the number of Graduate students and number of PG students is 5 : 3.
In College C, 50% of the total number of students are Junior College students. Out of the remaining,
$${5 \over 8}$$th are Graduate students and the remaining are PG students.In College D, 35% of the total number of students are Graduate students,$$ {8 \over {13}}$$th of the remaining students are Junior College students and the rest 1500 are PG students.